Video: ISIS beheads British hostage Alan Henning

This Tuesday, July 22, 2014 photo shows a motorist passing by a flag of the Islamic State group in central Rawah, 175 miles (281 kilometers) northwest of Baghdad, Iraq, nearly six weeks since a Sunni militant blitz led by the Islamic State extremist group seized large swaths of northern and western Iraq. (AP Photo) | Radio-Canada

Screen shot from an Internet video released Friday that purports to show an ISIS militant beheading British aid worker Alan Henning, who had been taken hostage by the extremist group.

Screen shot from an Internet video released Friday that purports to show an ISIS militant beheading British aid worker Alan Henning, who had been taken hostage by the extremist group.

Video released purporting to show Islamic State killing British hostage Alan Henning http://t.co/QP3ith31ma http://t.co/aA65MHuoBC

Screen shot from the end of the video ended during which an ISIS militant threatened a man they identified as an American named Peter Edward Kassig.

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CAIRO (AP) - An Internet video released Friday purports to show an Islamic State group fighter beheading British hostage Alan Henning, the fourth such killing carried out by the extremist group now targeted in U.S.-led airstrikes.

The video mirrored other beheading videos shot by the Islamic State group, which now holds territory along the border of Syria and Iraq, and ended with a militant threatening a man they identified as an American named Peter Kassig.

"Obama, you have started your aerial bombardment of Shams (Syria), which keeps on striking our people, so it is only right that we continue to strike the neck of your people," the masked militant in the video said.

Two U.S. officials, who spoke on condition of anonymity out of concerns of not having permission to release the information, confirmed that Kassig was being held by Islamic State militants. The officials declined to elaborate.

The Associated Press could not immediately verify the video's authenticity, though it was released in the same manner as other Islamic State group videos and the masked militant sounded similar to the one who carried out the other slayings.

In a statement, the British Foreign Office said it was working to verify the video.

"If true, this is a further disgusting murder," the statement read. "We are offering the family every support possible; they ask to be left alone at this time."

Britain has been supporting U.S. military efforts against the Islamic State group by using British forces to help with logistics and intelligence gathering, as well as recently taking part in airstrikes in Iraq. The Internet video released Friday begins with a news clip announcing British strikes against the Islamic State group.

"Alan had gone to Syria to help get aid to people of all faiths in their hour of need," Cameron said in a statement. "The fact that he was taken hostage when trying to help others and now murdered demonstrates that there are no limits to the depravity of these ... terrorists.

"We will do all we can to hunt down these murderers and bring them to justice."

President Barack Obama's counterterrorism adviser, Lisa Monaco, said the U.S. had seen the video and was evaluating it.

Later, Obama said the United States strongly condemned Henning's "brutal murder." He said the U.S., along with Britain and other allies, will "work to bring the perpetrators of Alan's murder" to justice and will continue to "taking decisive action to degrade and ultimately destroy" the Islamic State group.

French President Francois Hollande said he is "outraged by the heinous crime."

"This crime like previous ones will not be unpunished. France will continue to lend support to the people and authorities of Iraq in their fight against terrorism," Hollande said in a statement.

This is the fourth such video released by the Islamic State group. The full beheadings are not shown in the videos, but the British-accented, English-speaking militant holds a long knife and appears to begin cutting his victims, who include American reporter James Foley, American-Israeli journalist Steven Sotloff, British aid worker David Haines and now Henning.

FBI Director James Comey has said American officials believe they know the identity of the masked militant, though he's declined to name the man or reveal his nationality.

Kassig, a 26 year-old American now threatened by the Islamic State group, enlisted in the Army in 2004, and became a Ranger, ultimately serving in the 75th Ranger Regiment, an Army special operations unit.

According to his military record, Kassig trained at Fort Benning, Georgia in 2006, and deployed to Iraq from April to July 2007. He was medically discharged at the rank of private first class in September 2007. His home of record at the time of his enlistment was Indianapolis, Indiana.

His parents, Ed and Paula Kassig, issued a statement through a media relations firm, asking for the world to pray for their son.

"The Kassig family extends our concern for the family of Alan Henning. We have read about his work and his generous character with great respect and admiration," the statement said. "We ask everyone around the world to pray for the Henning family, for our son, and for the release of all innocent people being held hostage in the Middle East and around the globe."

The family said Kassig had been working for the relief organization SERA when he was captured on Oct. 1, 2013 on his way to Deir Ezzour in eastern Syria. He converted to Islam while in captivity and the family has heard from former hostages that his faith has provided him comfort.

Henning, 47, nicknamed "Gadget," had joined an aid convoy and was taken captive on Dec. 26, shortly after crossing the border between Turkey and Syria. Earlier this week, Henning's wife Barbara Henning asked the militants in a televised plea: "Please release him. We need him back home."

Dozens of Muslim leaders in Britain have urged the Islamic State group to release Henning. His wife had said she had been given hope by "the outcry across the world" over her husband's imprisonment.

Mohammed Shafiq, chief executive of the Ramadhan Foundation, a Muslim charity, called Henning "a British hero."

His "barbaric killing is an attack against all decent people around the world," Shafiq said.

The Islamic State group has its roots in al-Qaida's Iraqi affiliate but was expelled from the global terror network over its brutal tactics and refusal to obey orders to confine its activities to Iraq. It became even more extreme amid the bloody 3-year civil war in neighboring Syria, growing stronger to the point of being able to launch a lightning offensive across much of northern Iraq, routing security forces there and shooting down an Iraqi helicopter on Friday. The group has become known for filming and releasing footage of mass shootings it conducts, as well as beheading opponents and targeting religious and ethnic minorities in the areas it attacks.

The extremist group has been widely denounced by mainstream Muslim authorities.

Other foreigners are believed held by the Islamic State group. On Friday, the father of John Cantlie, a British photojournalist held by the group, appealed for his release in a video, saying he was a friend of Syria.